Process for removing halide impurities by resin treatment

摘要

A method for the purification of carboxylic acids and anhydrides to remove halide impurities therefrom which comprises contacting the acid or anhydride with a macroporous styrene-divinylbenzene co-polymer containing pendant functional groups containing at least one weak acid metal salt capable of reacting with the halide to form a metal halide precipitate and separating the resulting purified acid or anhydride from the polymer.